A beam of electrons is accelerated from rest through a potential difference of 0.120 kV and then passes through a thin slit. The diffracted beam shows its first diffraction minima at ±13.0∘ from the original direction of the beam when viewed far from the slit. Do we need to use relativity formulas? explain pleaseHow wide is the slit?

One splits the atoms and molecules  the other combines them

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

Ok what do you need with